Hi movingbits,
This is perhaps more a question for the support:
http://www.maxon.net/support/support-questions.html
Check your Wacom settings/preferences. See image.
The Pen used in the video was the 6D pen from the Wacom Intous 3. With the Intous 3 the “standard pen (which was included back then) did not work as such. Intous 3—which I haven’t installed anymore on the current Mac. But I just tested the Intous 4, with two different pens, and it works here. I do not have a newer one here.
Make certain to have the latest update of R16, and the newest Wacom software. 6.3.15-2 is the version I have in use here.
http://www.wacom.com/support/product-support/drivers?pid=F27CF3DFA7594D5C8F34EE3D77A17DE7
Perhaps check in Photoshop if the pen works there, this information will accelerate the “case”.
If you would share more details, I’m happy to look into it.
All the best